Radeon X1900 GT Rev. 2 is a variant of the Radeon X1900 GT that comes with a slightly higher operating memory clock (660MHz VS 600 MHz) but also with its central unit underclocked (512MHz VS 575MHz). Unfortunately, its performance ends up being worse than the first variant since this GPU does not benefit from extra memory bandwidth and falls behind previous in series Radeon X1800 XT.